Edit:I meant to post this in the Anti-Virus and Anti-Malware Software forum. Mods should feel free to move this to wherever it belongs.
I had a long post written about this yesterday that I was going to start a thread with, but this site denied me- I am guessing due to a browser setting of mine. I am out of town now, using a different computer and won't have much acces to the one that had the issue for about a week.
Two days ago I downloaded and installed DVDVideosoft Free Studio from their website (DVDVideosoft,com), and I had already had AVG Antivirus Free Edition 2014 runing on my computer. Everything seemed fine at first, but the next day AVG's resident shield popped up with a 'Threat Detected' warning, claiming it had located a 'potential trojan agent' and giving me the option of removing the treat or ignoring- I chose to remove.
I then did a full computer scan with Malwarebytes which took a couple of hours. During this scan, AVG resident shield popped up repeatedly with new detected threats, always 'potential trojan agent's, and in a different file each time. This happened about every 10 minutes, although it probably wasn't at exactly regular intervals- I didn't time them.
At the end of the scan, Malwarebytes had found a couple of suspicious files (OpenCandy PUP) and I set it to remove them, which prompted me to reboot- which I chose to do. After making that choice, AVG popped up with another 'threat detected' warning- but the computer was already shutting down and I never even had a chance to do anything about that one.
I decided that if these pop-ups continued to happen, I would uninstall Free Studio- because installing it was the only significant change I had made to my computer recently and because many (though not all) of the files that AVG resident shield was warning about were part of that installation.
While rebooting- after leaving the light blue introductory screen to my normal desktop view, but while services and startup programs were still loading- AVG popped up with a 'threat detected' warning again. It may have said the exact same stuff as the one I saw immediately before the reboot commenced, I don't know. I imediately uninstalled Free Studio and the problem went away and didn't return.
I don't know if these were all false positives from AVG or if Free Studio was actually, repeatedly attempting to install malware, or what. All I know for sure is that this particular problem (literally dozens of 'threat detected' warnings) had never happened prior to installing Free Studio, and stopped happening once I uninstalled it. That couldn't possibly just be coincidence.
That particular computer is now, as far as I could tell, completely malware free. It has no performance troubles, and no inexplicable wackiness beyond what I reported above - which now appears to be over.
My plan is to simply avoid installing that particular piece of software again and hope that nothing like this happens again. If anyone has any advice, or perhaps an explanation, I am all ears
Edited by yu gnomi, 21 March 2014 - 01:15 PM.